Finishing touches on black hole compressor (#3060)

Co-authored-by: Martin Robertz <dream-master@gmx.net>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: BucketBrigade <138534411+CookieBrigade@users.noreply.github.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/src/main/resources/assets/gregtech/shaders/blackhole.vert.glsl b/src/main/resources/assets/gregtech/shaders/blackhole.vert.glsl
new file mode 100644
index 0000000000..57cea0b81c
--- /dev/null
+++ b/src/main/resources/assets/gregtech/shaders/blackhole.vert.glsl
@@ -0,0 +1,81 @@
+#version 120
+
+uniform float u_Time;
+uniform float u_Stability;
+uniform float u_Scale;
+uniform vec3 u_CameraPosition;
+
+varying vec2 v_TexCoord;
+
+const float PI = 3.14159265358979323846;
+
+const float HORIZON_EDGE = 2.6;
+
+mat4 rotateMatrix(float angle, vec3 axis){
+    float x = axis.x;
+    float y = axis.y;
+    float z = axis.z;
+
+    float c = cos(angle);
+    float s = sin(angle);
+    float t = 1.0 - c;
+
+    return mat4(
+        c+x*x*t,     t*x*y - s*z, t*x*z + s*y, 0.0,
+        t*x*y + s*z,   t*y*y + c,   t*y*z - s*x, 0.0,
+        t*x*z - s*y,   t*y*z + s*x, t*z*z + c,   0.0,
+        0.0,           0.0,         0.0,         1.0
+    );
+}
+
+
+
+
+
+void main() {
+
+    v_TexCoord = gl_MultiTexCoord0.xy;
+
+    //Extremely fragile system to deteriminte if isolate parts of the blackhole
+    //Would break with any uv remaping or atlas stiching
+    bool isDisk = (abs(v_TexCoord.y-.5f)>.245);
+    bool isBack = (abs(v_TexCoord.x-.5f)>.245) && isDisk;
+    bool isFront = (abs(v_TexCoord.x-.5f)<.255) && isDisk;
+    bool isBot = (v_TexCoord.y < .5) && isBack;
+
+    float yAngle = atan(u_CameraPosition.z,u_CameraPosition.x) - PI/2;
+    float c = cos(yAngle);
+    float s = sin(yAngle);
+    mat4 yRotate = mat4(
+        vec4(c, 0.0, s, 0.0),   // First column
+        vec4(0.0, 1.0, 0.0, 0.0), // Second column
+        vec4(-s, 0.0, c, 0.0),  // Third column
+        vec4(0.0, 0.0, 0.0, 1.0) // Fourth column
+    );
+
+
+    float base = length(gl_Vertex.xyz);
+    float stab = (base>HORIZON_EDGE)?u_Stability:1;
+
+    float scale = ((base-HORIZON_EDGE)*stab+HORIZON_EDGE)/base;
+    scale = max(scale, .1);
+    scale*=u_Scale;
+
+
+    vec4 rotated = yRotate * vec4((gl_Vertex.xyz*scale),1);
+
+    vec3 cameraDirection = normalize(u_CameraPosition);
+    cameraDirection = !isBot?cameraDirection:-cameraDirection;
+    vec3 rotateAxis = cross(cameraDirection,vec3(0,1,0));
+    float angle = acos(dot(cameraDirection,vec3(0,1,0)));
+    if (isFront) angle = 0;
+
+    float instabilityRotation =(u_Stability<=0)?u_Time/10:0;
+
+    mat4 rotate = rotateMatrix(angle,normalize(rotateAxis));
+
+
+    mat4 rotateB = rotateMatrix(instabilityRotation,normalize(u_CameraPosition));
+
+    gl_Position = gl_ModelViewProjectionMatrix * (rotateB* (rotate * (rotated)));
+}